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LINK BOARD PROJECT UPGRADE

LINK BOARD PROJECT UPGRADE. Pigi Paolucci and Napoli group. Outline. LB CAD project LVDS suppressor studies LV regulator studies Open questions To be done. LV Regulator LHC4913. LB project schema. Test schema LHC4913. Temperature Tests. Vin = 5V Vout = 3.3V

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LINK BOARD PROJECT UPGRADE

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  1. LINK BOARD PROJECT UPGRADE Pigi Paolucci and Napoli group

  2. Outline • LB CAD project • LVDS suppressor studies • LV regulator studies • Open questions • To be done Pigi Paolucci

  3. LV Regulator LHC4913 Pigi Paolucci

  4. LB project schema Pigi Paolucci

  5. Test schema LHC4913 Pigi Paolucci

  6. Temperature Tests Vin = 5V Vout = 3.3V Iout = 1.4A (Load=2.3W//2200uF); Ta = 27°C; Td = 91°C 1 volt 1 msec Vin Vout 2 msec Pigi Paolucci

  7. Rumping up and down Vin Vout Vin Vout Pigi Paolucci

  8. Temperature Tests Vin=5V; Vout=3.3V Iout=2.6A (Load=1.2W//2200uF); Ta=27°C; Td=135°C 1 volt 1 msec Vin Vout Pigi Paolucci

  9. Rumping up and down Vin Vout Vin Vout Pigi Paolucci

  10. Different Loads Vin=5V; Vout=3.3V Iout1=1.4A (Load=2.3W//2200uF) Iout2=2.6A (Load=1.2W//2200uF) Vin Vout Pigi Paolucci

  11. How does react to input spikes Vin=5V; Vout=3.3V Iout1=1.4A (Load=2.3W//2200uF) Spike=5V / Vin=10V  Spike su Vout > 10mV Vin Vout Pigi Paolucci

  12. Heat Dissipation Tmax (junction) = 125°C; Rcase (junction) = 2°C/W (datasheet) Working case Vin = 5V; Vout = 3.3V; Iout = 1.5A Power to dissipate = (5V - 3.3V) * 1.5A = 2.55W; Tamb=25°C Rtot = DT/W = (125°C – 25°C)/2.55W = 39°C/W Rheatsink= Rtot-Rjc = 37°C/W Worst case Vin=6V; Vout=3V; Iout=3A Power to dissipate= (6V – 3V) * 3A = 9W; Tamb = 40°C Rtot = DT/W = (100°C - 40°C)/9W = 6.6°C/W Rheatsink= Rtot-Rjc = 4.6°C/W Pigi Paolucci

  13. Max temperature behaviour Test Conditions Vin=6V; Vout=3.3V; Iout=2.6A; Tamb=25°C Temperature on the case: 155°C -:- 135°C Pigi Paolucci

  14. Regulator Infrared scan Standard condition Worst case – before shutdown Worst case – after shutdown Pigi Paolucci

  15. Regulator heat sink tests probe ISO-TECH ITA11 probe IR FLUKE Ti25 Tjmax=125°C; Rjcase=2°C/W (datasheet) Working conditions: Vin=5V; Vout=3.3V; Iout=1.5A Power to dissipate= 5-3.3*1.5 = 2.55W; Tamb=25°C; • No forced air flow • Horizontal flip position Worst case condition: Vin=6V; Vout=3.3V; Iout=2.7A Power to dissipate= 6-3.3*2.7 = 7,3W; Tamb=25°C; • No forced air flow • Horizontal flip position

  16. working case Flip RS-467451 Tir=74°C / Ttc=70°C (after 15 minutes) Flip RS-6744709 Tir=65°C / Ttc=59°C (after 15 minutes) Vin=5V; Vout=3.3V Iout=1.5A; Ta=25°C; Flip RS-492159 Tir=67°C Ttc=61°C (after 15 minutes)

  17. worst case Tir=146°C / Ttc=135°C (after 15 minutes) Vin=6V; Vout=3.3V Iout=2.7A; Ta=25°C; Flip RS-492159 Tir=125°C / Ttc=115°C (after 15 minutes) Tir=115°C / Ttc=109°C (after 15 minutes)

  18. Heat sink choosen Flip RS-492159  R=14.5°C/W

  19. Heat sink choosen Vin=5V Vout=3.3V Iout=1.5ATa=20°C; (fan ON) Tir=56°C / Ttc=51°C (after 20 minutes) Tir=134°C / Ttc=119°C (after 1 hour) Vin=6V Vout=3.3V Iout=2.7° Ta=25°C (fan OFF) Tir=133°C / Ttc=119°C (after 4 hours)

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